Features: 1. **3-in-1 Testing**: Our pool test strips measure pH, alkalinity, and chlorine levels, ensuring your pool water is safe and clean for swimming. Perfect for comprehensive water quality checks! 2. **Easy to Use**: Simply submerge the strip in water for 2 seconds, hold it for 15 seconds, and compare with the color chart. No complicated procedures, just quick and accurate results! 3. **Reliable Results**: Formulated with stabilizers and chromate acid-base indicators, our strips provide precise readings to help you maintain optimal water conditions. 4. **50 Strips Included**: Each pack contains 50 test strips, giving you plenty of tests to keep your pool water balanced throughout the season. Great value for pool owners! 5. **Health & Safety**: Regular testing with our strips helps prevent waterborne illnesses and ensures a safe swimming environment for you and your family. Our pool test strip 3-in-1 contains stabilizers and chromate acid-base indicators. It can detect whether the water quality meets the standards and ensure your life and health. Its usage method is very simple: 1.Submerge the test strip under water for 2s; 2. Hold it still in the air for about 15s; 3. Compare pool test strip to color chart on bottle. And it can test the total alkalinity, chlorine and pH value.